Cisco NCS 5500 Series

CHAPTER 4
BGP-based VPWS Autodiscovery
An important aspect of VPN technologies is the ability of network devices to automatically signal to other
devices about an association with a particular VPN. Autodiscovery refers to the process of finding all the
provider edge routers that participates in a given VPWS instance.
The two primary functions of the VPWS control plane are: auto-discovery and signaling. Both of these
functions are accomplished with a single BGP Update advertisement.
When a VPWS cross-connect is configured with BGP auto-discovery and signaling enabled, BGP needs to
distribute NLRI for the xconnect with the PE as the BGP next-hop and appropriate CE-ID. Additionally, the
cross-connect is associated with one or more BGP export Route Targets (RTs) that are also distributed (along
with NLRI).
•
Configuring VPWS with BGP Autodiscovery and Signaling, page 153
•
VPWS with BGP Autodiscovery and BGP Signaling, page 156
Configuring VPWS with BGP Autodiscovery and Signaling
Perform this task to configure BGP-based autodiscovery and signaling.
BGP Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
153